(2S,10S,11R)-1-(tert-Butyl-diphenyl-silanyloxy)-12-(4-methoxy-benzyloxy)-11-methyl-2,10-bis-trimethylsilanyloxy-dodec-7-yn-6-one

{(2S,6R,8S)-8-[(R)-2-(4-Methoxy-benzyloxy)-1-methyl-ethyl]-10-methyl-1,7-dioxa-spiro[5.5]undec-10-en-2-yl}-methanol